fsck_msdosfs(8) on FreeBSD
The text bfc39e815ff6, as FreeBSD 4.11-RELEASE, FreeBSD 4.10-RELEASE, FreeBSD 4.9-RELEASE, FreeBSD 4.8-RELEASE shipped it.
DOS/Windows (FAT) filesystem consistency checker
Flags it lists
-
-F -
-f -
-n -
-p -
-y